CVE-2025-6491 — NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix

Description (CNA)

In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.

Affected (CNA)

Vendor / product	Versions
PHP Group / PHP	affected 8.1.* before 8.1.33; affected 8.2.* before 8.2.29; affected 8.3.* before 8.3.23; affected 8.4.* before 8.4.10

CWE

CWE-476

References

https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x

CVE

No English description supplied.

https://lists.debian.org/debian-lts-announce/2025/07/msg00017.html
http://www.openwall.com/lists/oss-security/2025/07/11/4